Fix potential segfault
Fix potential segfault

The newEnv variable was accessed (via the dynamicEnv) pointer after it
had gone out of scope.

Fixes #234.

joelmo/nix,tchajed/nix,dtzWill/nix,jcumming/nix,puffnfresh/nix,acowley/nix,pikajude/nix,offlinehacker/nix,nbp/nix,puffnfresh/nix,garbas/nix,rycee/nix,bjornfor/nix,ehmry/nix,offlinehacker/nix,garbas/nix,tchajed/nix,NixOS/nix,offlinehacker/nix,peti/nix,garbas/nix,zimbatm/nix,tchajed/nix,bennofs/nix,ysangkok/nix,joelmo/nix,gebner/nix,layus/nix,vcunat/nix,wmertens/nix,gridaphobe/nix,zimbatm/nix,shlevy/nix,rowhit/nix,rycee/nix,dezgeg/nix,rowhit/nix,zimbatm/nix,dtzWill/nix,shlevy/nix,dezgeg/nix,vcunat/nix,wmertens/nix,vizanto/nix,aucampia/nix,rowhit/nix,ttuegel/nix,garbas/nix,vizanto/nix,NixOS/nix,bennofs/nix,aucampia/nix,dtzWill/nix,nbp/nix,ysangkok/nix,dtzWill/nix,bennofs/nix,ehmry/nix,layus/nix,garbas/nix,gridaphobe/nix,ehmry/nix,ttuegel/nix,ttuegel/nix,ehmry/nix,ysangkok/nix,dtzWill/nix,bjornfor/nix,dezgeg/nix,vizanto/nix,vizanto/nix,wmertens/nix,layus/nix,puffnfresh/nix,ehmry/nix,shlevy/nix,jcumming/nix,peti/nix,bennofs/nix,puffnfresh/nix,peti/nix,offlinehacker/nix,bjornfor/nix,joelmo/nix,gridaphobe/nix,jcumming/nix,NixOS/nix,layus/nix,nbp/nix,tchajed/nix,acowley/nix,rowhit/nix,shlevy/nix,acowley/nix,dezgeg/nix,rycee/nix,NixOS/nix,vcunat/nix,nbp/nix,rycee/nix,acowley/nix,ehmry/nix,gebner/nix,aucampia/nix,zimbatm/nix,dezgeg/nix,pikajude/nix,layus/nix,peti/nix,bjornfor/nix,gebner/nix,pikajude/nix,shlevy/nix,gridaphobe/nix,aucampia/nix,vcunat/nix,peti/nix,joelmo/nix,NixOS/nix,ttuegel/nix,rycee/nix,wmertens/nix,gebner/nix,jcumming/nix